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A p-n photodiode is fabricated from a se...

A p-n photodiode is fabricated from a semiconductor with band gap of `2.8 eV ` . Can it detect a wavelength of 6000nm ?

Text Solution

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Energy ( E ) = `( hc )/( lambda) = ( 6.6 xx 10^(-34) xx 3 xx10^(8))/( 6000 xx 10^(-9) xx 1.6 xx 10^(-19)) eV = 2.06 eV `.
The band - gap is 2.8 eV and energy E is less than band gap `( E lt E_(g))`. So p-n junction cannot detect the radiation of given wavelength 6000 nm.
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